Thursday, 5 November 2026 | 15:00 | K-space, Lund University
In connection with the upcoming PhD defence of Viktor Rindert, we are pleased to invite you to a mini-workshop bringing together researchers working with advanced optical and spectroscopic techniques to investigate functional materials. The program will highlight recent developments and applications of spectroscopy to explore electronic, structural, magnetic, and defect-related phenomena in a range of materials systems.
Programme
15.00 Premysl Marsik – University of Freiburg
Strain-Dependent Multiferroicity in TbMnO₃ Thin Films Observed by IR Ellipsometry
15.30 Ivan Scheblykin – Chemical Physics and NanoLund, Lund University
Metal-Halide Perovskites and Their Luminescence
16.00 Vanya Darakchieva – Solid State Physics, NanoLund and Terahertz Materials Analysis Center (THeMAC), Lund University
Highlights from the Terahertz Materials Analysis Center (THeMAC)
16.30 Discussions
17.00 End
All interested colleagues are warmly welcome to join us for the presentations and scientific discussions.
Presentation abstracts
Premysl Masik – Strain-Dependent Multiferroicity in TbMnO₃ Thin Films Observed by IR Ellipsometry
Terbium manganite (TbMnO₃) is a well-known multiferroic in which ferroelectricity is driven by a non-collinear magnetic spin structure. In this presentation, infrared ellipsometry is used to investigate the phonon properties of epitaxial TbMnO₃ thin films with different thicknesses and strain states. The phonon spectra reveal changes associated with strain and crystallographic orientation, as well as an unexpected splitting of an infrared-active mode in the thinnest, highly strained films below approximately 40 K. This observation may be related to symmetry changes associated with magnetic ordering, providing insight into the coupling between lattice and magnetic degrees of freedom.
Ivan Scheblykin – Metal-Halide Perovskites and Their Luminescence
This presentation will explore the distinctive optical properties of metal-halide perovskites and how they differ from conventional semiconductors such as Si and GaAs. Photoluminescence (PL) spectroscopy and imaging are used to investigate non-radiative processes and reveal the dynamic nature of defects, whose type and concentration can change with illumination, temperature, and electrical bias. Such dynamic defect behavior may contribute to the apparent defect tolerance and other unusual properties of these materials. The presentation will also introduce the concept of the memlumor (memory + luminophore), a luminescent memory element for fully optical neuromorphic computing, and demonstrate its potential for processing information using light as both input and output.
Vanya Darakchieva – Highlights from the Terahertz Materials Analysis Center (THeMAC)
This presentation will highlight recent developments and research activities at the Terahertz Materials Analysis Center (THeMAC), focusing on advanced terahertz spectroscopic approaches for investigating semiconductor materials and heterostructures. We will present two directions: the terahertz optical Hall effect to investigate electronic transport properties in two-dimensional electron gases (2DEGs), and terahertz electron paramagnetic resonance ellipsometry (THz EPR-E) to probe paramagnetic defects, spin transitions, and interactions among spin, orbital, and lattice degrees of freedom in semiconductors.
Related event: PhD defence
The mini-workshop is organized in connection with the PhD defence of Viktor Rindert, which will take place on:
Friday, 6 November 2026, at 13:15
Rydberg Hall, Lund University
We look forward to seeing you at the mini-workshop!